Use $VIMBLACKLIST to temporarily disable bundles.
Allow disabling rest of vimrc by adding it to blacklist.
Expand bundle/{a,b} as bundle/a and bundle/b.
Experimental: Support "vimfiles" subdirectory.
Work around weird lockup on ancient Vim.
Restore disabling of paths ending in ~.

Add pathogen#legacyjoin() which escapes spaces for older options like 'path' and 'tags'.
Fix pathogen#join() to not escape spaces (caused problems on many Windows setups).
Add pathogen#uniq() to filter out duplicates.
Add pathogen#helptags() to generate helptags for everything in 'runtimepath'.